Novak's KryoFlow II Radiator

for

1987-1995 YJ Wrangler Jeeps

Jeep Radiator & Fan Assembly
Our optional high powered integrated fan and shroud married directly to our radiator.

Novak's HD cross-flow radiator for 1987-1995 Jeep Wranglers is made to be the most innovative on the Jeep aftermarket. Jeep engine swappers have the challenge of keeping more powerful engines cool within the confines of one of the smallest grill spaces in the automotive industry.

These radiators are fabricated in-house at Novak since 2012, where we have relentlessly pursued radiators which have:

  • Maximum heat exchange with two 1-1/4" wide tubes in alloy aluminum
  • Durability
  • Unmatched features; each radiator assembly includes:
    • Floating cradle assembly, allowing the radiator to float in silicone pads within the provided mounting bracket
    • Industry standard filler neck and radiator cap, for easy future replacement
    • Standard drain fitting, accessible with a conventional 5/16" socket Allen wrench
    • Lower cotter pins design for easier radiator release when engine bay service may require it
    • Sacrificial anode (however, you should still ground your radiator to prevent corrosion!)
    • Simple, barbed overflow fitting
    • Bungs for temperature senders and steam ports
    • Ideal fin density with louvers
    • Furnace brazed headers and TIG welded final assembly
    • Every radiator pressure tested, heat imaged and empirically scored for maxium heat exchange

Our radiators do not feature integrated transmission coolers, as we choose to focus the unit's entire cooling power on the engine. More on this, below.

Fan/shroud assemblies ordered with the radiator come pre-assembled for a "drop-in" package saving substantial time on your part.

For Generation I-II Chevrolet Engines

Jeep YJ radiator for Chevy V8 engine

#K-YJ10H, Radiator, KryoFlow II, Jeep YJ with GM Gen I-II engines. Aluminum, high-efficiency crossflow. TD/BP

The classic Small Block Chevy version of our radiator features the 1-1/2" diameter top inlet on the driver's side and the lower 1-5/8" outlet on the passenger's side.

Chevrolet V8 SBC

Kit contents:

  • Radiator
  • Radiator cradle bracket, zinc plated
  • Radiator cap, 16lb
  • Silicone cradle grommets
  • Plugs, brass, 3/8" NPT
  • Fitting, barbed, 1/4 x 1/8 NPT, overflow
  • Washers, mounting
  • Cotter pins, mounting
  • Anode, sacrificial

Need engine mounts for this swap?

For Generation III+ GM LS / Vortec Engines

YJ radiator for GM LS Vortec engines

#K-YJ30H, Radiator, KryoFlow II, Jeep YJ with GM Gen III+ engines. Aluminum, high-efficiency crossflow. TP/BP

The LS version of our radiator features a 1-1/2" diameter top inlet on the passenger's side and the lower 1-3/8" outlet on the passenger's side.

GM LS Vortec Engine

Kit contents:

  • Radiator
  • Radiator cradle bracket, zinc plated
  • Radiator cap, 16lb
  • Silicone cradle grommets
  • Plugs, brass, 3/8" NPT
  • Fitting, barbed, 1/4 x 1/8 NPT, overflow
  • Washers, mounting
  • Cotter pins, mounting
  • Anode, sacrificial

Need engine mounts for this swap?

For Ford Small Block V8 & AMC V8 Engines

YJ radiator for GM LS Vortec engines

#K-YJ20H, Radiator, KryoFlow II, Jeep YJ with Ford & AMC V8 engines. Aluminum, high-efficiency crossflow, TP/BD

The Ford & AMC version of our radiator features a 1-1/2" diameter top inlet on the passenger's side and the lower 1-5/8" outlet on the driver's side.

Ford V8 Engine

Kit contents:

  • Radiator
  • Radiator cradle bracket, zinc plated
  • Radiator cap, 16lb
  • Silicone cradle grommets
  • Plugs, brass, 3/8" NPT
  • Fitting, barbed, 1/4 x 1/8 NPT, overflow
  • Washers, mounting
  • Cotter pins, mounting
  • Anode, sacrificial

Need Ford engine mounts for this swap?

Need AMC V8 engine mounts for this swap?

More Details

Transmission Cooling Options

Because modern engines run a bit hotter than earlier engines and automatic transmissions prefer to be kept at cooler temperatures, we at Novak choose to offer radiators without an integrated automatic transmission cooler option. These coolers are more effective run as separate units. This method is confirmed by trends in the OEM automotive industry. See Related Products, below, for our recommended transmission cooler for most Jeeps.

Note that the bungs and brass plugs provided in the Novak radiator tanks are for temperature sensors and steam vents, not for transmission cooler lines.

Cradle Bracket

radiator cradle bracket for Jeep
The cradle bracket allows some float with the radiator to keep the stresses and strains down.

Unlike other radiator systems on the market the KryoFlow system is designed to meet the needs of a Jeep in an off-road environment. Typical Jeep use differs from a race or street car, which don't see the strains, flex and jarring typical of off-road use. Instead of using brackets welded to the tanks, our cradle grips and cushions the radiator with a compressible, heat-resilient silicone padding that allows the radiator to "float" eliminating fatigued radiator joints. Featuring a total of six isolators; two on the bottom hold pins positively locating the radiator while the tanks are held by two on either side. The bracket holds the radiator securely yet absorbs the twists and bumps of the trail isolating potential strains.

V8 Radiator in YJ Jeep

Fan Options

Cooling fan for Jeep V8 radiator

The radiator may be compatible with many electric and conventional mechanical fans. We recommend our FX Series Electric Fan which combines a high-powered fan and integrated shroud into one effective package, available in Related Products, below.

If you order your fan at the time of your radiator order, we will join them together for you and package them for combined shipment.

Applications & Compatibility

Radiator neck and cap
We use standard fittings and caps on our radiators, so the installer can configure and service their system as they wish.

These assemblies are designed to fit the 1987-1995 Wrangler YJ models with engine conversions appropriate to the model selected. The dimensions of the radiator are 24.25"W x 18.5"H x 7.5" D. Because of the extra radiator thickness these will not work with the stock 4.0L engine due to length constraints of the inline 6 cylinder configuration.

Related Products


Electric cooling fan for YJ Jeeps
Electric fan controller sensor relay kit
Electric fan controller sensor relay kit
Auto transmission cooler
Stainless coolant overflow tank

Installation Requirements

Typical mechanics hand tools are required along with the appropriate hoses, clamps and coolant required with a normal radiator swap. After installing this upgrade radiator, we recommend that the installer should verify fan-to-radiator clearance and engine mount integrity before operating the Jeep.

Radiator Warranty Policy

Our radiators come with a 1-year / 100% warranty for defects in materials or workmanship, which is prorated and Novak will cover the cost as follows:

  • 1 year, 100%
  • 2 years, 75%
  • 3 years, 50%
  • 4 years, 25%

The above does not include incoming shipping of your radiator to Novak.

Coverage can be denied if it is determined that:

  • Abuse has occured; no radiator can withstand shoddy installation or debris striking the radiator
  • Electrolysis has occurred due to failure to ground the radiator to the frame
  • Overpressured. We do not recommend exceeding 16psi on the cap

Our overall warranty and other policies are found here. We strongly recommend you educate yourself about cooling and the related topics here before taking on this or any custom vehicle cooling project.

Also See